Carburetor primer



I. W. SWAN.

ARBURETOR PRIMER.

APPLICATION FILED SEPT. 15, 1919.

I Patnted Feb. 21,1922.

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2 SHEETS-SHEET attorney 5.

J. W. SWAN. CARBURETOR PRIMER. IAPPLICATION FILED SEPT. 15, 1919,

Patented Feb. 21, m2

2 SHEETS' SHEET 2.

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GARB'URETOR PltIfEl-ft.

Application filed September To all whom it may concern Be it known that1, JOHN l/V. SWAN, a citizen of the United States, residing at Stamford,in the county of'Fairfield and State of Connecticut, have inventedcertain new and useful Improvements in Carburetor Primers, of which thefollowing is a specification, reference. being had therein to theaccompanying drawing.

This invention relates to improvements in carburetors for internalcombustion engines.

It is well recognized that in starting an internal combustion enginewhen cold a very rich. mixture, or, as a matter of fact, substantiallyraw fuel, must be introduced to the cylinder. To facilitate a rapidstarting of an engine when in this condition, it is usually the.practice to fill the pet cocks of each cylinder with fuel to be directlyintroduced thereto, or to employ an independent or auxiliary primingsystem by which fuel may be introduced to the cylinder. Both of thesemethods of priming are troublesome, the latter being expensive, whilethe former requires much time on the part of the operator, andboth arefar from being effective. L

It is an object of the present invention to provide a carburetor havinga priming device incorporated therein by which raw fuel may beintroduced to the engine anifold to be delivered to the cylinders whenstarting the engine, the priming device being controllable by. theoperator from the .drivers seatat all times.

is a further object. of the invention to provide a oarburetor having apriming device that is normally out of feeding relation with the engine,but is adapted to be moved from its normal to a feeding position by anoperating element accessible from the drivers seat.

It is still another object of the invention toprovide a carburetor inwhich single actuating means is provided for moving the'priming devicefrom its normal to a feeding position upon a starting of the en ine whena raw fuel is to be delivered to the cylinders, which actuating devicealso controls the fuelsupplly valve regulating the admission of fuel tothe carburetor mixing chamber by which the ratio of fuel and.

driving.

Specification of Letters Patent.

Patented Feb, 21, 1922.

15, 1919. Serial Ito. 333,5??11.

The invention more specifically comprises a carburetor having a movablepriming tube normally maintained above the fuel level of the carburetorfloat chamber, which is adapted to be shifted bodily into the fuel atone end and simultaneously establish a communication at its opposite endwith a supply pipe leading to the engine manifold.

Vfhen retained in this position, substantially raw fuel is delivered tothe engine cylinders fromthe float chamber, a release of the actuatingmeans resulting in a return of the priming tube-to its normal positionwhere itis out of feeding relation with the engine.

In the accompanying drawings I have shown the preferred embodiment ofthe invention, but it will, of course, be understood that many changescan be made without. tleparting from the spirit thereof.

in thedrawings: i 1

Figure 1 is a tide e evation with parts in section; and, i

Figure 2 is a fragmentary view showing a part of the carburetor insection.

Referring now more particularly to the drawings, wherein like referencecharacters indicate corresponding parts, the nnmeal 1 designates acarburetor which may be of any conventional type, having the usualgasoline feed 2, and float chamber 3 into which the gasoline isdelivered. llleading from the float chamber is a fuel feed to the mixingchamber 4- of the carbur 101', and to control the quantity of fuelentering the mixing chamber and thereby regulate and control thecondition of the mixture, needle valve is employed, being operated bythe oscillating lever onioun ed upon the valve operated spindle "d. Itwil be uni stood this valve is merely for the purpose of controlling thequantity of fuel that is to be admittec to the mixing chamber during theoperation of the end-inc, that a lean, rich, or perfect mixture may beprovided for introduction to the engine cylinders when the engine isunder way and .in operation.

Disposed cent the float chamber on one side thereof and mounted for arestricted movement is a priming tube fl, lower end thereof extendingthrough aperture 7 in the portion passing thr' the chamber, while theupper end This aperture enters the feed passage 9 above the carburetorand is for the introduction'of raw fuel thereto upon the starting of theengine. Thepriming tube 6 is normally maintained out of feeding relationwith the feed passage 9 by the action of the coil spring 13 seated uponthe surface of the top of the float chamber 8, bearing thereagainst atone end, while the upper end of the spring impinges against the undersurface of an operating arm ll fixedly attached to the priming tube sothat a movement thereof causes a complement-ill movement of the tube,the operating arm it near its lower end having a hooked end 15 adaptedto be engaged and operated by the lever by a means which will be laterdescribed. it

will therefore be seen, that the priming tube is normally urged into aninoperative position, as disclosed in Fig. 1, by the action of thespring 13, the lower end thereof at this time being raised beyond thesurface of the fuel in the float chamber 3), while the upper end is sucha position as to close the feed orilice 12, the upward movement of thepriming tube being limited by the engagement of the arm 14 with thewalls of the bore r.

The lever 5 is operated preferably by a wire 16 attached thereto at oneend, while the opposite end of the lever is connected with any suitablecontrol device preferably of the nature disclosed in my co-peudingapplication, Serial No. 319.878, filed August 26, 1919. An operation ofthis wire in one direction causes a movement of the needle valvecontrolled by the spindle 6 regulating the supply of fuel from the floatchamber to the mixing chamber et of the carburetor so that a lean, richor normal mixture may be had at the will of the operator when the engineis under way. the character of the mixture depending upon the differentconditions encountered, it being observed, however, the mixture is underinstant control and variable as may be desired. lVhen the engine iscold, to start the same. it is. of course, preferable to introducesubstantially raw material to the cylinders to facilitate an easystarting, which is now usuallv accomplished by the filling of cocks oneach individual cylinder. This method is trouble-' some, requiring muchtime and on the whole is not satisfactory.

In the present invention when it is desired to start an engine withwhich th being man? ,001.)

buretor is attached, the feed wire 16 is moved to the position shown inFig. 2, it observed that the outer end of the lever 5 has engaged thehooked portion of the arm 1 drawing the priming tube '6 downward untilits lower end is immersed in the body of fuel in the float chamber 3,the upper end of the tube having passed below the feed aperture 12 sothat when the en ine is turned over, raw fuel is drawn diredtlv from thefloat chamber through the tube ti, the orifice lZand into the feedpassage 9 above the throttle valve of the carburetor, the throttle valvebeing preferably closed upon the starting of the engine. The

priming tube is maintained in thisbosition until the engine has beenstarted and then the lever 5 is moved, the spring 13 urging the primingtube upwardly to this normal position, as shown in Fig. 1, wherein thelower end of the tube is raised above the surface of the level of thefuel in the float chamber, the primer, when in this position, beinginoperative, as no fuel can be fed from the float chamber to the passage9.-

As the engine becomes heated, or under different conditions, it isnecessary to regulate the mixture, and in the present invention thesingleo 'lerating wire 16 is employed for moving the primer into afeeding relation. and for controlling the quantity of fuel admitted tothe mixing chamber through the needle valve which may be of the usualcon; struction operated by the spindle 6. It will be observed that whenthe wire is moved in one direction, serving to move the end of the lever5 downwardly, the hooked end of the primer is engaged causing thepriming tube to be moved into a feeding relation, as shown in Fig. 2;while if the wire is moved in an opposite direction, the free'end of thelever 5 is raised, allowingthe priming tube to return to its normalposition under the influence of the spring 13, a continued movement ofthe lever having no influence whatever on the hooked end 10 of the arm14, serving to operate the needle valve controlling the fuel supply tothe carburetor alone, thus permitting a mixture to be formed within thecarburetor chamberthat may be rich, lean or normal as maybe desired.

Having thus described the invention, What I claim is ing with saidmixing chamber above the throttle valve, a valve controlling thesupplyfrom the fuel chamber to the mixing chamher, a priming tube leading fromthe fuel chamber to the fuel passage above the throttle valve, and asingle means for controlling the passage of fuel through the primingtube and the fuel supply to the mixing chamber.

2. Ina carburetor, the'co'mbination with a fuel chamber, of a mixingchamber having a throttle valve, a fuel passage communr eating with saidmixing chamber above the throttle valve, a valve controlling the supable member and an operating element connected therewith.

3. A carburetor having a float chamber and a mixing chamber, a throttlevalve for said carburetor, a fuel passage leading from the carburetor tothe engine, a priming tube carried by said carburetor, means fornormally maintaining said priming tube out of feeding relation withthecarburetor, and means for bodily moving the priming tube whereby thelower end thereof is immersed in the fuel in the float chamber fordelivering fuel directly from the float chamber to the fuel passage at apoint above the throttle valve.

'4. In a carburetor, the combination with a float chamber, of ztthrottlevalve for said carburetor, a fuel supply establishing communicationbetween the carburetor and an engine, a priming tube carried by saidcarburetor and having a communication with the fuel passage above thethrottle valve, means for normally maintaining the priming tube out offeeding relation with the fuel passage and the float chamber, and meansfor moving the priming tube bodily into feeding relation with the floatchamber and the fuel passage. r

5. A carburetor having a float chamber and a fuel passage leading fromthe carburetor to the engine, a throttle valve, a slidable priming tubecarriedby said carburetor and normally out of feeding communication withthe fuel passage, and means for sliding said tube for establishingcommunication between said fuel passage and the float chamber fordelivering fuel directly from the fuel chamber to the fuel passagebeyond the throttle valve.

6. A carburetor having. a float chamber and a fuel passage leading fromthe carburetor engine, a throttle valve, a priming tube carried by thecarburetor and a communi cation between said carburetor and the fuelpassage beyond the throttle valve, means for-normally maintaining thepriming tube out of feeding relation with the passage, and means formoving the priming tube bodily so as to place one end thereof into thefuel in the float chamber, and to simultaneously establish communicationbetween the upper end thereof and the fuel passage-way for deliveringsubstantially raw fuel to the fuel passage beyond the throttle valve.

l. in a carburetor, the combination with a fuel chamber, of carburetingcl and means for delivering fuel tn means for varying the uantity of fuemitted to the carbureting chamber, rs passage throughwhich the miature)asses prior to being delivered to engine, throttle valve controllingthe supply from the carbureting chamber to thefuel passage, a primingtube leading from the fuel c ran.- ber and having-a communication withthe fuel passage above the throttle valve, and a single operating meansfor controlling the passage of fuel through the priming tube and thefuel supply to. the carbureting chamber.

8. In a carburetor, the combination with a fuel chamber, of acarbureting chamber and means for delivering fuel thereto, means forvarying the quantity of fuel admitted to the carbureting chamber, a fuelpassage through which the mixture passes prior to being dc livered tothe engine, a throttle valve con: trolling the supply from thecarbureting' chamber to the fuel passage, a priming tube leading fromthe fuel chamber and having a communication with the fuel passage abovethe throttle valve, and a single operating means for controlling thepassage of fuel through the priming tube and the fuel supply to thecarbureting chamber, said means comprising a shiftable lever having aportion adapted to engage an operating arm on the priming tube whenmoved in one direction but to exert no influence on said arm when movedin an opposite direction, and to cause an operation of the valvecontrolling the passage of fuel to the carbureting chamber.

.9. A carburetor having a float chamber and a throttle valve, a fuelpassage leading from the carburetor above the throttle valve, a primingtube carried by said carburetor and a communication between the tube andthe fuel passage when said tube is in feeding relation therewith, meansfor normally maintaining the tube out of feeding relation with thepassageway comprising a resilient member cooperating therewith, andmeans for moving the tube whereby the lower end is immersed in the fuelin the float chamber and communication between the passage and the tubesimultaneously established.

10. A carburetor having a float chamber and a throttle valve, a fuelpassage leading from the carburetor above the throttle valve, a primingtube'carried by said carburetor and a communication between the tube andthe fuel passage when said tube is in feeding relation therewith, meansfor normally maintaining the tube out of feeding relation with thepassage-way comprising a resilient member cooperating therewith, meansfor moving the tube whereby in the fuel in the floatchamber andcommunication between the passage and the tube the lower end is immersedsimultaneousl established said means comand a fuel passage prising anoperating lever connected with the tube and having an engaging portionat one end, and a shiftable arm cooperating with said engaging portion.

11. In a carburetor, the combination with a fuel chamber and a throttlevalve for said chamber, a fuel passage establishing communicationbetween the carburetor and an engine, a priming tube carried by thecarburetor and a normally closed communication between the fuel passageand the priming tube, and means for establishing a feeding relationbetween the priming tube and the fuel passagecomprising an arm connectedwith the priming tube and an operating lever associated with said armfor shift ing the same to correspondingly shift the priming tube into afuel feeding position to deliver fuel directly from the float chamber tothe fuel passage.

12. A carburetor having a fuel chamber leading from the carburetor tothe engine, a movable priming tube communicating with the fuel chamberand normally out of communication with the fuel passage, and means foroperating the tube for establishing communication between the fuelchamber and fuel passage.

13. A carburetor having a fuel chamber and a fuel passage leading fromthe carburetor to the engine, a spring controlled movable priming tubecommunicating with the fuel chamber and normally held out ofcommunication with the fuel passage by the spring, and means foroperating the tube for placing the spring under tension and establishingcommunication between the fuel chamber and fuel passage.

1a. A carburetor having a fuel chamber and a fuel passage leading fromthe carburetor to the engine, a movable priming tube for establishingcommunication between the fuel chamber and fuel passage, means fornormally holding the lower end of the tube above the fuel level, andmeans for lowering the end of the tube into the fuel.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

JOHN w. swan.

Witnesses:

J AS. FERRIss, H. E. Sam.

